Morris Dam, Gravity dam in Los Angeles County, United States.
The Morris Dam is a gravity structure that spans the San Gabriel River in Los Angeles County, rising 245 feet (75 meters) above the riverbed. It features a concrete overflow spillway designed to manage water flow during high-water periods.
Construction began in 1932 and finished in 1934, with former President Herbert Hoover attending the official dedication. This completion marked an important milestone in regional flood management infrastructure development.
The dam carries the name of Samuel Brooks Morris, who served as the chief engineer for the Pasadena Water Department during its construction. Locals and water professionals recognize it as an important piece of regional water management history.
The reservoir sits at an elevation of 1,145 feet and serves dual purposes in flood control and groundwater replenishment for the region. Visitors should be aware of water level changes that vary seasonally and affect access to certain areas around the structure.
From the 1940s through the 1990s, the reservoir served as a testing ground for naval weapons development, including torpedoes and ballistic missiles. This Cold War role remained largely unknown to the public until many decades later when historical records were declassified.
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